Check-valve



(No Modm J. STR()MVVALL.v

CHECK VALVE.

No. 599,650. l- Patented Peb. 29,1898.

Nrrnn STATES y Arnim* Prion,

JOHN STROMVALL, OF SPRINGFIELD, MASSACHUSETTS.

CHECK-VALVE.

SPECIFICATION formingpart of Letters Patent No. 599,650, dated February22, 1898. i

Application led October 23, 1897. Serial No. 656,139. (No model.) i

To all whom, 'it may concern:

Be it known that I, JOHN STRoMvALL, a citizen of the United States ofAmerica, residing at Springfield, in the county of Hampden and State ofMassachusetts, have invented new and useful Improvements in Check-Valves, of which the following is a specification.

This invention relates to steam-boiler connections, and particularly tothe check-valve construction interposed between an injector or feed-pumpsupplying water to a steamboiler, the object of the invention being toproduce a check valve construction the check-valveproper (if which maybe reground to its seat in the body of the valve while the full pressureof steam is on the boiler, thereby avoiding any interference with theuse thereof While said check-valve `is being reground, as described, andalso providing against the escapeofsteam from said boiler should thecheck-valve body be accidentally broken off from the neck -tl1ereof, bywhich connection is made with the boiler; and the invention consists inthe-arrangement and construction of the parts, all as set forth in thefollowing speciication and pointed out in the claims. j

In the drawings forming part of this speciication, Figure 1 represents acheck-valve body in end elevation constructed Iaccording to my inventionand screwed into the shell of a boiler, a portion of;` which is shown insection. Fig. 2 is a side"'elevation .of the valvebody shown in Fig. 1,showing attached to the inlet end thereof by a union-joint the end of afeed-pipe leading to an injector orvfeedpump. Fig. 3 is a section ofFig. 1 on line fr, Fig- 2. Fig. t is a section of Fig. 3 on line ,ze ofthat figure. Fig. 5 is a sectional view similar to Fig. 3 with some ofthe parts removed.

Referring to the drawings, A represents a p portion of the shell of aboiler, in which the valve-body B is secured by a screw-threaded neck 2on said valve-body entering a suitably-threaded hole in said shell inthe ordinary manner. The said screw-threaded neck is of two diameters,the one described for screwing into the boiler-shell and a smaller one 3projecting into the interior of said boiler and concentric with saidlarger diame- 4is provided in the neck 2, which leads into the chamber 7in the valve-bodyT B above the check-valve f8., fThe latter is of theusual construction and is guided in its movements away'from and towardits seat 9 by the vertical wingslO, common to valve constructions ofthis ,description and cast on :the body of the valve. Said check-valveis provided with a projection 12 on the upper side thereof and centrallylocated thereon. The valve-body B is provided with an opening 13 abovesaid check-valveLS, through which said valve may be introduced lin thevalve-body B andapplied to its seat, and a screw-cap 14 closes saidopening. On the under side of said cap 14 is a depending projection v15,located over the projection l2, and the length of said projection l5determines the degree to which said check-valve 8 shall bepermitted torise above its seat.

A passage r6 in the valve-body B is provided, which extends from theinlet 17 to the opening through the valve-seat 9 and communicating whenvthe check-valve 8 is raised o from itsseat with the chamber 7 in saidvalve-body, and from thence through the passage 6 into the boiler, asindicated by the arrows applied to-Figs. 3 and 4.

The valve 5', above referred to, seats against the inner end of the'passage 6 in the valvebody B, as shown in Fig. 5, and said valve isprovided withthe wings 1'8 to hold it in line axially with said passage6 and to provide passage-ways for the feed-water through the passage 6when said valve 5 is off from its seat, and projecting from the end ofsaid valve 5 within the valve-body is the stem 19 and integral with saidvalve. This stem is preferably made square, as shown in Fig. 4, andenters a squarevsocket in the end of the spindle 20, which is supportedin the valve-body for movement toward and from the inner end of thevalve 5 and. axially in line therewith. For the support of said spindlea hole 21 through the valve-body B is provided, in which the spindle 2Omay freely move. Said hole is counterbored and screw-threaded for thereception of a packing-nut 22, in the head of which the IOO threadedouter end of said spindle has a screwengagement, and between the innerend of said packing-nut and the bottom of the counterbore a packing 23of a suitable nature and a compressing-ring 24 are located, the end ofthe said packing-nut 22 bearing on said compressing-ring 2l. By screwingup the nut 92 the ring E24 compresses more or less the packing 23 aroundthe spindle at a point beyond the threaded part thereof. The end of saidspindle projects beyond the end of the packing-nut 22, and a hand-wheel25 is secured thereto, whereby it may be operated.

The stem 19 of the valve 5 is made square for engagement with the squaresocket in the end of the spindle 2O for the purpose of providing meansfor turning the valve 5 in its seat should it become clogged or shouldany impurities in the water form on said seat and prevent the tightclosing of the valve. Normally the said valve 5 is positively held openby the spindle 20, as shown in Figs. l and 3, and the feed-pump orinjector may then be run uninterruptedly to feed water to the boiler,said valve being held in said open position by screwing the spindle 20into the valve-body as far as may be necessary. Should it becomenecessary for any purpose to open the valve-body to remove thecheck-valve S for grinding it or to grind its seat 9, then the spindle2O would be screwed out until the valve 5 comes to a seat, closing thepassage G by means of the pressure of steam in the boiler, and anyrepairs can then be effected, as above stated.

This construction obviates the necessity of reducing the pressure in theboiler to effect repairs on any part of the boiler connection outside ofthe neck 3, and as said check-valve is subjected to very hard andconstant use such repairs are not infrequent. Furthermore, in case theherein-described construction is in use on a locomotivesboiler orportable boilers of any other description in cases of accident theboiler connections are liable to be broken off, and should thisvalve-body B be broken off the steam-pressure would at once close thevalve 5 and thus prevent the scalding of any one near by.

In Fig. 5 is shown what parts of the valve construction can be removedtherefrom while 'full pressure remains on the boiler.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

l. A check-valve body, a dividing-partition therein, an inlet to, and anoutlet from said body, on opposite sides of said partition, an openingthrough the latter, a check-valve controlling said opening, a valvelocated in aud adapted to close said outlet by pressure external to saidvalve-body, a support for said valve on which it has a free slidingmovement, and whereby it may be forced, and held, off from its seat, andmeans for connecting the inlet end of said Valve-body with the feedpipeof a pump or injector and for connecting said outlet end thereof with asteam-boiler, substantially as described.

2. A check-valve comprising a body having a screwed neck for attachmentto a boiler, a valve closing the passage through said neck to saidboiler, and means for supporting said valve in axial alinement with saidpassage, consisting of a screw-rod on the end of which said valve mayhave a longitudinally-sliding movement, and whereby it may be forciblymoved in one direction, an inlet-nozzle communicating with a passageleading to said neck, a check-valve in said passage, and a removable capin said body opposite said checkvalve, whereby the latter may beoperated for regrinding the same while the valve in said neck is closed,substantially as described.

JOHN STROMVALL.

\Vitnesses:

Il. A. CHAPIN, K. I. CLEMoNs.

